P U R O F L U X C O R P O R A T I O N
SAMPLE SPECIFICATION: PF-40 SAND MEDIA FILTER
Filtration system to be a factory assembled package with control panel, control valves, face piping, and electric actuator. Unit shall be a PUROFLUX model PF-40__ designed for a maximum flow rate of __ gpm. The filter system shall utilize tower water for the backwash supply. The filter package shall be constructed as follows:
VESSEL:
Vessels shall be of non-code carbon steel construction; fusion bonded epoxy lining/polyester exterior coating and designed for 50 psi service. Vessels to be hydro tested at 1.5 times design pressure and be equipped with a manual & automatic air relief valve. The vessels shall be equipped with epoxy coated carbon steel handhole located in the top head and handhole located in the tank side shell, (1) 3/4" drain and vent connection located in the lower/upper head.
MEDIA:
Filter shall be supplied with a uniformly grade silica sand media, rated to remove suspended solids down to 10 micron at 95% efficiency.
INTERNALS:
The filter units shall have a removable underdrain laterals constructed of Sch. 80 PVC, with a 3-point distribution overdrain constructed of Sch. 80 PVC for even flow across the filter media. The filter shall have an ABS drain screen installed at the bottom of filter vessel in order to keep media from draining when the vessel drain plug is removed.
ACTUATOR & VALVES:
The filter shall be equipped with a single electric valve actuator. Control valves shall be (4) positive sealing lug-style butterfly valves, mechanically linked in a master/slave configuration. Valves will move simultaneously in to the backwash mode when a backwash cycle is initiated. Upon completion of the backwash cycle all valves will move simultaneously back into the filter mode. (Optional pneumatic actuator is available upon request.)
(Optional) PUMP & MOTOR/PRE-STRAINER:
Pump shall be cast iron bronze fitted, close couple end suction type centrifugal with cast iron pre-strainer with removable stainless steel basket. Motor to be standard efficiency, TEFC and rated for ___VAC, ___ Hz. Pump will be rated to deliver __ GPM @ 50’ TDH.
(Optional) PIPING:
All Interconnecting piping to be completed using SCH. 80 PVC.
(Optional) STRUCTURAL SKID:
Filter package shall be assembled and contained on steel skid. Skid shall be designed to support the filter vessel, pump, and piping. The structural skid shall be fusion bonded polyester coated.
CONTROLS:
Filter to be supplied with (Manual/Automatic) controls
· Manual units: Filter to be supplied with manual linkage handle to initiate/terminate the backwash cycle. All electrical to supplied by others.
· Automatic Units: Filter to be supplied with automatic controls, consisting of a Nema 4X enclosure, door disconnect switch, motor and circuit overload protection (for units with optional pump), electric valve actuator, step-down transformer, pressure differential switch, adjustable solid state backwash timer, and 24-hour backwash time clock. Filter shall have a single electrical hook-up point.
PUROFLUX Corporation • (805) 579-0216 • Fax (805) 579-6005
Rev. 01/10